When will cramps start?

I'm 13. I got my first period in the beginning of February last year, so almost a year. My periods usually last 5-7 days, and are normally a medium to heavy flow. I'm a virgin, but I masturbate by rubbing my clit. I wear pads. Why have I never gotten cramps before? Do they start when you're older? Will I get them? Please help! 

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